8
Electrical Connections
75
60
50
43
37
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
118
95
79
68
59
53
47
N/R
N/R
N/R
N/R
N/R
N/R
188
150
125
107
95
83
75
68
63
58
54
N/R
N/R
301
241
201
172
150
134
120
109
100
93
86
80
75
471
376
314
269
235
209
188
171
157
145
134
125
118
N/R = NOT RECOMMENDED
Wire ampacity and voltage drop calculation based on copper conductors with 75 degree C insulation per
1996 National Electrical Code (NEC) Conductors in 86 degree F ambient.
See NEC for ampacity derating for higher ambients.
27.5
30
12.5
15
17.5
20
MAXIMUM ALLOWABLE WIRE LENGTH IN FEET TO LIMIT VOLTAGE DROP TO 2%
10
MINIMUM CIRCUIT AMPACITY OF OUTDOOR UNIT (MCA)
40
32.5
35
37.5
WIRE SIZE
(AWG)
22.5
25
6
14
12
10
8
Table 1
NOTE: This table is provided as a guide only. Wire sizing may be regulated by local codes. Local inspection is the final
authority on wire sizing. Local codes will usually require that a disconnect switch be located near the unit. Do not locate
the disconnect switch on the unit itself.
The wiring diagram for this unit can be found on the control box door.
Wiring
Wire size is important to ensure proper unit operation.
Wire size must be sufficient to carry the minimum circuit
ampacity listed on the unit serial data plate. We recom-
mend sizing the wires to limit the voltage drop to a maxi-
mum of 2% from the main breaker or fuse panel to the
outdoor unit. A thermostat is required.
1. To connect the unit to the power supply, route the
power supply and ground wires through the high
voltage entrance in the unit.
2. Connect the power supply wires to the contactor.
Connect the ground wire to the ground lug.
3. Route the low voltage wiring through the low voltage
entrance in the unit. Connect the low voltage wires to
the terminal strip (if present) or to the wire leads.
Route the low voltage wire through the wire tie pro-
vided in the unit for restraint.
4. Connect the thermostat to the unit.
Consult the instructions packaged with the thermo-
stat for mounting and location instructions.
For field-supplied low voltage wiring and connec-
tions, refer to page 12. Refer to thermostat instruc-
tion sheet for wiring configurations for other types of
indoor equipment.
5. Ensure all factory wiring connections are tight.
WARNING
To avoid personal injury, shock, or death, disconnect
the electrical power switch before electrically
connecting the unit. Wiring must conform with NEC
or CEC and all local codes.
WARNING
To avoid the risk of fire or equipment damage, use
only copper conductors.
WARNING
Consult the National Electrical Code or a qualified
electrician for proper wire size. Undersized wires
could cause poor equipment performance,
equipment damage, or fire.
WARNING
To avoid electrical shock, personal injury, or death,
wiring to the unit must be properly grounded.
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